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【单选题】
频率可用下列哪种方式表示(c——光速,λ——波长,σ——波数)
A.
σ/c
B.
C.
1/λ
D.
c/σ
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参考答案:
举一反三
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【单选题】如下哪种说法正确?
A.
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B.
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C.
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D.
通过研究方向分析可了解检索结果中的主要作者
【单选题】化学在生产和日常生活中有着重要的应用。下列叙述正确的是
A.
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B.
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C.
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D.
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A.
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B.
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【单选题】下列是日常生活中接触到的物质,属于纯净物的是(  )
A.
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B.
洁净的空气
C.
自来水
D.
可乐饮料
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